> For the complete documentation index, see [llms.txt](https://platform9.com/kb/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://platform9.com/kb/pmo/frequently-asked-questions/vm-migration-failed-due-to-insufficient-memory.md).

# VM Migration Failed Due to Insufficient Memory

## Problem

VM migration fails due to the insufficient memory on the source host. Ostackhost logs shows cannot allocate memory error like below:

{% tabs %}
{% tab title="Bash" %}

```bash
qemu-kvm: failed to initialize KVM: Cannot allocate memory
```

{% endtab %}
{% endtabs %}

## Environment

* Platform9 Managed OpenStack - v4.0 and Higher

## Cause

Source host do not have enough memory available to migrate the VM.

## Resolution

It is always recommended to have enough resources on the host running production workloads. But, in this situation we need to either stop some low priority VMs or add up more resources on the host.


---

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